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Texas Instruments OPA244PA
- Part No.:
- OPA244PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA244PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,865
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Product details
Overview
OPA244PA from Texas Instruments (formerly Burr-Brown) is a single, rail-to-rail input micro-power operational amplifier in an 8-pin DIP package, delivering 430kHz gain-bandwidth, 50µA/channel quiescent current, and ±1.1V to ±18V dual-supply or +2.2V to +36V single-supply operation. It features rail-to-rail output swing (to within 0.75V of V+ and 0.1V of V–), 86dB open-loop gain, and input common-mode range extending to V– - making it ideal for low-voltage battery-powered current sensing and portable instrumentation.
For engineers reviewing the OPA244PA datasheet, OPA244PA pinout, OPA244PA application, or OPA244PA equivalent, key selection criteria include its ultra-low IQ for extended battery life, guaranteed performance across wide supply and temperature ranges (–40°C to +85°C), unity-gain stability, and absence of phase inversion - critical for precision analog front-ends in space-constrained, single-supply systems.
Technical Context
The OPA244PA employs a CMOS input stage enabling picoampere-level input bias current (–10nA typ), high input impedance (10⁹Ω || 2pF common-mode), and rail-to-rail input voltage range including ground. Its internal compensation ensures unity-gain stability without external components, while the output stage delivers ±12mA short-circuit current and drives capacitive loads up to 100pF with controlled overshoot.
Designed for low-noise, low-distortion signal conditioning, it achieves 22nV/√Hz input voltage noise density at 1kHz and 0.4µVP-P integrated noise (0.1–10kHz). The amplifier maintains consistent GBW, slew rate (±0.16V/µs), and CMRR (84dB min) across its full operating voltage and temperature range - eliminating recalibration needs in varying environmental conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 430kHz - supports stable closed-loop operation up to ~400kHz at G = 1, suitable for anti-aliasing and sensor signal conditioning. |
| Quiescent Current | 50µA per amplifier - enables multi-year battery life in always-on monitoring nodes powered by coin cells or Li-ion packs. |
| Supply Voltage Range | +2.2V to +36V single or ±1.1V to ±18V dual - operates directly from unregulated battery stacks or industrial 24V rails without LDO pre-regulation. |
| Input Common-Mode Range | 0V to (V+) – 0.9V - includes ground, allowing direct interfacing with single-ended sensors and ADC references in 3.3V/5V systems. |
| Output Voltage Swing | (V+) – 0.75V / 0.1V (RL = 20kΩ to ground) - maximizes dynamic range in low-voltage data acquisition with minimal headroom loss. |
| Input Offset Voltage | ±1.5mV max (25°C), ±2mV over –40°C to +85°C - supports 12-bit accuracy in precision current/voltage measurement without trimming. |
| Open-Loop Gain | 86dB min - ensures <0.1% gain error in G ≥ 10 configurations, critical for transimpedance and difference amplifiers. |
Pinout & Package
OPA244PA is housed in an industry-standard 8-pin plastic dual in-line package (PDIP), 0.300" wide, with 0.100" lead pitch and through-hole mounting. Thermal resistance θJA is 100°C/W, supporting operation up to +125°C junction temperature.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–In) | Differential input node; accepts signals referenced to ground or mid-supply; high-impedance CMOS input. |
| 2 | Non-Inverting Input (+In) | Differential input node; used for follower, summing, or differential configurations; same impedance as Pin 1. |
| 3 | Output (Out) | Class AB output stage; capable of sourcing/sinking ±12mA; rail-to-rail swing into 20kΩ load. |
| 4 | V– (Negative Supply) | Power supply return for dual supplies or ground reference for single-supply operation. |
| 5 | NC | No connect - internally unused; must be left floating or tied to ground per layout best practices. |
| 6 | NC | No connect - internally unused; no electrical function; avoid routing signals nearby. |
| 7 | V+ (Positive Supply) | Main power rail; accepts +2.2V to +36V; requires local 0.01µF ceramic bypass capacitor to ground. |
| 8 | NC | No connect - internally unused; electrically isolated; no thermal or EMI benefit from grounding. |
Key Features
| Feature | Design Value |
|---|---|
| MicroPower Operation | 50µA quiescent current enables >10-year battery life in wireless sensor nodes using CR2032 cells. |
| Rail-to-Rail Input | Common-mode range includes V– (ground), permitting direct connection to shunt resistors in low-side current sensing. |
| Unity-Gain Stable | No external compensation required - simplifies PCB layout and reduces BOM count in gain-of-1 buffers and filters. |
| No Phase Inversion | Eliminates output latch-up during input overdrive - essential for robust operation in protection circuits and motor control feedback. |
| Wide Supply Range | Operates from 2.2V (single-cell LiFePO₄) to 36V (industrial 24V + margin), reducing need for multiple op-amp families across product lines. |
Applications
| Battery Current Monitoring | Portable Medical Sensors |
|---|---|
Use Scenario: Real-time measurement of charge/discharge current in lithium-ion battery packs using low-value shunt resistors. IC Role / Device Role / Timing Role: Precision current-sense amplifier configured in high-side or low-side topology with fixed gain. Use Value: Enables accurate state-of-charge estimation with ±1% full-scale error over temperature, leveraging rail-to-rail input and 50µA IQ for continuous logging. | Use Scenario: Signal conditioning for ECG, pulse oximetry, or glucose sensor outputs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-drift buffer and amplifier stage preceding 12-bit SAR ADCs. Use Value: Delivers 0.4µVP-P noise (0.1–10kHz) and ±2mV offset drift over –40°C to +85°C, preserving clinical-grade signal fidelity. |
| PCMCIA Card Analog I/O | Industrial Power Supply Feedback |
Use Scenario: Analog interface for legacy PCMCIA cards requiring compact, low-power signal routing between host and peripheral. IC Role / Device Role / Timing Role: Level-shifting and buffering of sensor or DAC outputs within tight board area constraints. Use Value: 8-pin DIP footprint allows drop-in replacement of older op-amps; 430kHz GBW supports multiplexed multi-channel sampling at >10ksps. | Use Scenario: Voltage and current feedback loop conditioning in isolated DC-DC converters and programmable power supplies. IC Role / Device Role / Timing Role: Error amplifier in secondary-side regulation, driving optocoupler LED with precise gain and bandwidth control. Use Value: Guaranteed 86dB AOL and 430kHz GBW ensure stable loop response across 3.3V–36V input range, meeting EN 62368-1 transient immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2340UA | Higher IQ (220µA), rail-to-rail I/O, 5.5MHz GBW, SO-8 package only | Better speed/noise trade-off but consumes >4× more current; unsuitable for multi-year battery life | Select when bandwidth >1MHz is required and power budget allows >200µA per channel. |
| LMV321IDBVR | Lower IQ (60µA), rail-to-rail I/O, 1MHz GBW, SOT-23-5 package | Smaller footprint and lower cost, but higher offset (±3mV) and reduced CMRR (70dB) | Prefer for cost-sensitive, space-constrained designs where ±3mV offset is acceptable and 1MHz bandwidth suffices. |
Compared with OPA2340UA and LMV321IDBVR, the OPA244PA uniquely balances ultra-low power (50µA), wide supply range (+2.2V to +36V), and precision (±2mV offset, 84dB CMRR) in a through-hole DIP package - making it optimal for legacy-compatible, long-life, industrial-grade analog signal chains where layout flexibility and thermal robustness matter.
Availability
OPA244PA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial power supply feedback requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole assembly.
Supply support for OPA244PA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments acquired Burr-Brown in 2000 and maintains its precision analog portfolio, renowned for high-performance op-amps, data converters, and interface ICs targeting industrial, automotive, and medical markets.
The OPA244PA belongs to TI's MicroAmplifier™ series - designed specifically for ultra-low-power, high-precision signal conditioning in battery-operated and space-constrained systems where quiescent current, input offset, and supply flexibility are critical.
FAQ
What is the maximum operating temperature range for the OPA244PA?
The OPA244PA is fully specified from –40°C to +85°C and operates reliably from –55°C to +125°C. Its 100°C/W thermal resistance in the 8-pin DIP package enables sustained operation at elevated ambient temperatures when mounted on standard FR-4 PCBs with moderate copper pour, making it suitable for under-hood automotive auxiliary modules and industrial control cabinets.
Does the OPA244PA require external compensation for unity-gain stability?
No, the OPA244PA is internally compensated and unity-gain stable - no external capacitors or resistors are needed. This eliminates tuning complexity and layout sensitivity in buffer, follower, and active filter applications. The device maintains phase margin >45° across all supply voltages (2.2V–36V) and temperatures (–40°C to +85°C), as verified in the open-loop gain/phase vs. frequency plot in the official SBOS088 datasheet.
Can the OPA244PA drive capacitive loads, and what is the recommended limit?
Yes, the OPA244PA can drive capacitive loads up to 100pF with minimal overshoot (<10%) when configured in unity gain with RL = ∞ or 20kΩ. For loads exceeding 100pF, a small series resistor (10–50Ω) between the output and capacitance is recommended to maintain stability. This capability supports direct connection to ADC input capacitors and long PCB traces without added isolation stages.
What is the input bias current specification for the OPA244PA, and how does it affect high-impedance sensor interfaces?
The OPA244PA has an input bias current of –10nA typical (–25nA max) at 25°C, due to its CMOS input stage. When interfacing with high-impedance sources (e.g., pH electrodes or piezoelectric sensors >1MΩ), this bias current introduces <1mV error across a 100kΩ source resistance. For sub-mV accuracy, guard traces and low-leakage PCB materials are recommended - but the OPA244PA remains among the lowest-IB options in its DIP-packaged micro-power class.
Is the OPA244PA pin-compatible with other members of the OPA244 family, such as the OPA244NA or OPA244UA?
No - the OPA244PA (8-pin DIP) is not pin-compatible with the OPA244NA (SOT-23-5, 5-pin) or OPA244UA (SO-8, 8-pin). While all share identical electrical specifications, their packages differ mechanically and electrically: the DIP version has NC pins (5,6,8), whereas the SO-8 version uses all eight pins functionally. PCB redesign is required for substitution; however, schematic-level functional equivalence is maintained across all variants.
OPA244PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.16V/µs
- Gain Bandwidth Product:
- 430 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 700 µV
- Current - Supply:
- 50µA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA244PA FAQ
1.How can I place an order for OPA244PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA244PA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA244PA reliable?
The price and inventory of OPA244PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA244PA is usually 5 days.
3.What payment methods are accepted for OPA244PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA244PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA244PA?
OPA244PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA244PA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA244PA?
For technical support, including OPA244PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA244PA requirements.
6.How does Aetrix verify that OPA244PA is sourced from the original manufacturer or authorized distributors?
All OPA244PA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA244PA meets industry standards.
7.What is the process for return or replacement of OPA244PA?
All OPA244PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA244PA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA244PA part is unused and in its original packaging.
Return procedure for OPA244PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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